Monfils' injury does not appear likely to threaten his Australian Open run.

"David is an incredible player and today I was very tired," Monfils said. "Against a player like that he's very powerful and it's very physical."

Kohlschreiber broke Querrey in the third game of the first set and took the set in 26 minutes. After a service break apiece, Kohlschreiber swept to a 6-0 lead in the second set tiebreak and closed out the set in 42 minutes.

"I have to say it was a really great match from my side," Kohlschreiber said. "I played unbelievable."